Buunk B.P. and Schaufeli W.B. (1999). Reciprocity in interpersonal relationships: an evolutionary perspective on its importance for health and well-being. European Review of Social Psychology, 10: 259-291., DOI: 10.1080/1479277994300008

Schaufeli W.B. and Bakker A.B. (2010). The conceptualization and measurement of work engagement: A review. In: Bakker A.B. and Leiter M.P., editors, Work engagement: A handbook of essential theory and research. New York: Psychology Press, pp. 10-24.

Schaufeli W.B., Bakker A.B. and Salanova M. (2006). The measurement of work engagement with a short questionnaire: A cross-national study. Educational and Psychological Measurement, 66: 701-716., DOI: 10.1177/001316440528247

Schaufeli W.B. and Salanova M. (2008). Enhancing work engagement though the management of human resources. In: Näswall K., Sverke M. and Hellgren J., editors, The individual in the changing working life. Cambridge: Cambridge University Press, pp. 380-404.

Van Yperen N.W., Hagedoorn M. and Geurts S. (1996). Intent to leave and absenteeism as reactions to perceived inequity: The role of psychological and social constraints. Journal of Occupational and Organizational Psychology, 69: 367-372., DOI: 10.1111/j.2044-8325.1996.tb00622.